4-氨基吡啶树脂吸附钼(Ⅵ)

Experimental results indicated that the resin of 4-aminopyridine （4-APR） showed good ability to adsorb Mo（Ⅵ） at pH=4.1 in the HAc-NaAc medium.The statically saturated sorption capacity was 594 mg Mo（Ⅵ）·（g resin）-1,Mo（Ⅵ） adsorbed on 4-APR could be eluted by 3 mol·L-1 HCl or 3 mol·L-1 NaOH quantitatively. The sorption rate constants determined at various temperatures were respectively k15℃=2.24×10-5 s-1,k25℃=3.30×10-5 s-1,k35℃=4.79×10-5 s-1,and k45℃=6.85×10-5 s-1.The sorption apparent activation energy Ea was 29.1 kJ·mol-1.The sorption mechanism showed that the nitrogen atoms of the functional group of 4-APR coordinated with Mo（Ⅵ） to form coordination bonds,and the coordination molar ratio of [4-AP] to Mo（Ⅵ） was 1∶2.